/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.activiti.bpmn.converter;

import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;

import org.activiti.bpmn.converter.util.BpmnXMLUtil;
import org.activiti.bpmn.model.BaseElement;
import org.activiti.bpmn.model.BpmnModel;
import org.activiti.bpmn.model.StartEvent;
import org.activiti.bpmn.model.alfresco.AlfrescoStartEvent;
import org.apache.commons.lang3.StringUtils;

public class StartEventXMLConverter extends BaseBpmnXMLConverter {

    public Class<? extends BaseElement> getBpmnElementType() {
        return StartEvent.class;
    }

    @Override
    protected String getXMLElementName() {
        return ELEMENT_EVENT_START;
    }

    @Override
    protected BaseElement convertXMLToElement(XMLStreamReader xtr,
                                              BpmnModel model) throws Exception {
        String formKey = xtr.getAttributeValue(ACTIVITI_EXTENSIONS_NAMESPACE,
                                               ATTRIBUTE_FORM_FORMKEY);
        StartEvent startEvent = null;

        if (StringUtils.isNotEmpty(formKey) && model.getStartEventFormTypes() != null && model.getStartEventFormTypes().contains(formKey)) {
            startEvent = new AlfrescoStartEvent();
        }
        if (startEvent == null) {
            startEvent = new StartEvent();
        }
        BpmnXMLUtil.addXMLLocation(startEvent,
                                   xtr);
        startEvent.setInitiator(xtr.getAttributeValue(ACTIVITI_EXTENSIONS_NAMESPACE,
                                                      ATTRIBUTE_EVENT_START_INITIATOR));
        boolean interrupting = true;
        String interruptingAttribute = xtr.getAttributeValue(ACTIVITI_EXTENSIONS_NAMESPACE,
                                                             ATTRIBUTE_EVENT_START_INTERRUPTING);
        if (ATTRIBUTE_VALUE_FALSE.equalsIgnoreCase(interruptingAttribute)) {
            interrupting = false;
        }
        startEvent.setInterrupting(interrupting);
        startEvent.setFormKey(formKey);

        parseChildElements(getXMLElementName(),
                           startEvent,
                           model,
                           xtr);

        return startEvent;
    }

    @Override
    protected void writeAdditionalAttributes(BaseElement element,
                                             BpmnModel model,
                                             XMLStreamWriter xtw) throws Exception {
        StartEvent startEvent = (StartEvent) element;
        writeQualifiedAttribute(ATTRIBUTE_EVENT_START_INITIATOR,
                                startEvent.getInitiator(),
                                xtw);
        writeQualifiedAttribute(ATTRIBUTE_FORM_FORMKEY,
                                startEvent.getFormKey(),
                                xtw);

        if (startEvent.getEventDefinitions() != null && startEvent.getEventDefinitions().size() > 0) {
            writeQualifiedAttribute(ATTRIBUTE_EVENT_START_INTERRUPTING,
                                    String.valueOf(startEvent.isInterrupting()),
                                    xtw);
        }
    }

    @Override
    protected boolean writeExtensionChildElements(BaseElement element,
                                                  boolean didWriteExtensionStartElement,
                                                  XMLStreamWriter xtw) throws Exception {
        StartEvent startEvent = (StartEvent) element;
        didWriteExtensionStartElement = writeFormProperties(startEvent,
                                                            didWriteExtensionStartElement,
                                                            xtw);
        return didWriteExtensionStartElement;
    }

    @Override
    protected void writeAdditionalChildElements(BaseElement element,
                                                BpmnModel model,
                                                XMLStreamWriter xtw) throws Exception {
        StartEvent startEvent = (StartEvent) element;
        writeEventDefinitions(startEvent,
                              startEvent.getEventDefinitions(),
                              model,
                              xtw);
    }
}
